Journal of Mineralogical and Petrological Sciences
Online ISSN : 1349-3825
Print ISSN : 1345-6296
ISSN-L : 1345-6296
ORIGINAL ARTICLES
K-Ar ages of high-magnesian andesite lavas from northern Kyushu, Japan
Masaya MIYOSHITakashi NASUToshihiko TAJIMAMichio KIDOYasushi MORIToshiaki HASENAKAHidetoshi SHIBUYAKeisuke NAGAO
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2008 Volume 103 Issue 3 Pages 183-191

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Abstract

We determined the K-Ar ages for the high-magnesian andesites from Miocene-Pliocene period from Hikosan and Nagasaki areas in northern Kyushu, Japan. The obtained K-Ar ages of Hikosan and Nagasaki samples are 4.0-3.6 Ma and 5.8-3.7 Ma, respectively. These K-Ar ages suggest that the magmatisms of the high-magnesian andesites coincided with the development of the Okinawa Trough. The upwelling of the hot asthenospheric mantle associated with the backarc rifting probably has a close relationship with the origin of the northern-Kyushu high-magnesian andesite magma.

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© 2008 Japan Association of Mineralogical Sciences
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